I'm sorry to hear that you've been suffering. Here are a positive girl's tips on staying positive (presented positively!):
-Listen to happy music
Everyone is different, but this is my must-have. I listen to music every single day and if it wasn't happy, upbeat stuff, my mood would go south very quickly.
-Watch funny movies
Trust me, this is the last thing I feel like doing when I feel bad. Usually I want to wrap myself in a blanket and watch Law & Order til my eyeballs fall out. So one night I watched "City Slickers 2" and giggled and realized by the end of the movie that I had just had 2 hours of pain-free me. Laughing = endorphins = less pain.
-Have/discover hobbies that aren't too terrible to do while sitting on your couch at 2am with chest pain (case in point: me)
I took up knitting and Sudoku and it's been so helpful for me to have something else to do. I also study language while I am refluxing - anything that you enjoy to take your mind off of things.
-Surround yourself with good, caring people
It could be friends, it could be family, but supportive people in your life are essential. I have a few friends as well as my husband who are endlessly patient and supportive. However...
-Try not to let it take over your life
When I need to vent/ask questions, I usually come here. People who don't have GERD/chronic illness can only sympathize so much (and will invariably ask you if you've tried Tums/Maalox). So when I go to the doctor or have a particularly horrible night, these people who care about me will ask me what's wrong, and I will tell them, but only in a few sentences or so. If you talk about it all the time, it takes over your life and that's exactly what you don't want to happen.
Also, the biggest helpful hint to stay positive (as Denise posted above) is to keep coming back and reading about others' experiences. Some people have things that work for them that you can try and see if it works for you also.
There is also a fantastic book called "How Can You NOT Laugh at a Time Like This?: Reclaim Your Health with Humor, Creativity, and Grit" by Carla Ulbrich. It was recommended by the founder of this site and helped me be more positive in the face of GERD.
I'm just a few years younger than you and I know how frustrating it can be to have a limited life while others our age are out partying and eating pizza. Be strong!
I wish you all the best. You can stay positive if you put your mind to it! Don't be discouraged if you can only be positive for a few moments at a time at first - anything is better than nothing.
I hope you get some relief soon! Keep us posted.
Healing thoughts your way,